I own a Saturday Night Special. The Rohm 38s. It's a crappy gun, I know. But, It works, it's pretty reliable, and it is accurate every time. However, recently, my timing seems to be a bit off. It works great with lead, but when I fire full metal jackets, it will sometimes shave a bit of metal of and jam the cylinder. What should I do? Is there a simple way to adjust timing? Does it require a gunsmith? Or should I just stick to lead and forget about it?